Improvements in the CHERS system for DT experiments on TFTR

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Improvements in the charge exchange recombination spectroscopy (CHERS) system have resulted in accurate measurements of T{sub i} and V{sub {phi}} profiles during DT experiments. These include moving the spectrometer detector array and electronics farther away from the tokamak to a low neutron flux location. This relocation has also improved access to all components of the system. Also, a nonplasma-viewing calibration fiber system was added to monitor the change in fiber transmission due to the high flux DT neutrons. Narrowband filtered light transmitted through the calibration fiber is now used as a reference for the VO measurement. At the highest neutron ... continued below

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14 p.

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Bush, C.E.; Bell, R. & Synakowski, E.J. March 1, 1995.

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Improvements in the charge exchange recombination spectroscopy (CHERS) system have resulted in accurate measurements of T{sub i} and V{sub {phi}} profiles during DT experiments. These include moving the spectrometer detector array and electronics farther away from the tokamak to a low neutron flux location. This relocation has also improved access to all components of the system. Also, a nonplasma-viewing calibration fiber system was added to monitor the change in fiber transmission due to the high flux DT neutrons. Narrowband filtered light transmitted through the calibration fiber is now used as a reference for the VO measurement. At the highest neutron flux of {approximately} 2.5 {times} 10{sup 18} neutrons/see (fusion power {approximately} 6.2 MW) a modest 5% decrease in fiber transmission was observed. Corrections for transmission loss are made and T{sub i} (r,t) and absolute V{sub phi} (r,t) profiles are automatically calculated within four minutes of every shot.

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14 p.

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INIS; OSTI as DE95008716

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  • 10. topical conference on high-temperature plasma diagnostics, Rochester, NY (United States), 8-12 May 1994

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  • Other: DE95008716
  • Report No.: PPPL--3058
  • Report No.: CONF-940552--40
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 34229
  • Archival Resource Key: ark:/67531/metadc677347

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  • March 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • April 15, 2016, 5:32 p.m.

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Bush, C.E.; Bell, R. & Synakowski, E.J. Improvements in the CHERS system for DT experiments on TFTR, article, March 1, 1995; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc677347/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.